摘要
针对磨料流加工异形曲面一致性较差的问题,提出通过设置相似模芯结构以改善剪切应力分布的状态,从而实现均匀化加工异形曲面的方法。根据磨料流的剪切率与黏度的关系建立了幂律模型,通过COMSOL Multiphysics软件的CFD模块计算得到置入模芯时磨料介质在加工表面的速度、剪切率和剪切应力的分布。仿真与实验表明:置入相似的模芯后可形成等宽的流道,各曲面受到的剪切应力趋向一致。工件内壁表面粗糙度Ra最大差值由无模芯时的0.376μm降为置入模芯后的0.017μm。
In order to improve the consistency of a complex--shaped surface by AFM,a method of processing the complex--shaped surface uniformly was put forward. In the processing of the complex --shaped surface,the uniformity of the shear force distribution was improved and the consistency of the surface roughness was enhanced by setting up a mold core. At first,according to the properties of the abrasive medium and the relational algebra between the shear rate and viscosity,a power law mod- el was established. Then,the distribution of the velocities, shear rate and shear forces of the abrasive flow on the surface was obtained by CFD module of the COMSOL Multiphysics software. The simula- tion results show that the relatively uniform runner is formed and shear stress on every part of the ab- normity bent surface is more uniform when the similar shape of the mold core is inserted into the com- plex hole. The experimental results demonstrate that the surface roughness Ra is reduced from 0. 376μm to 0. 017μm through adopting the mold core.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2013年第17期2377-2382,共6页
China Mechanical Engineering
基金
国家自然科学基金资助项目(51005216)
浙江省自然科学基金资助项目(Y1110934)
浙江省科技厅公益项目(2011C21037)
关键词
磨料流加工
异形曲面
模芯
一致性
abrasive flow machining（AFM）
complex-- shaped surface
mold core
consistency
